From Internet Censorship Explorer:
The “magnify” component of the Search Monitor project attempts to match the top ten results from Google/Yahoo with the top ten results form the China-specific versions of Google/Yahoo in order to note the similarities and differences in terms of censored, returned (the website is in the top ten of the both the .com and .cn versions of the search engine) and indexed (the website is in the top ten of the .com version, but not in the top ten of the .cn version, but is not censored). It also compares the results based on whether or not each website is hosted in China or ends in a .cn. This is taken as a measurement of “authorized” content that is unlikely to present information that China would block.
